产品系列： <span>防伪系列</span>

Covert security: invisible to counterfeiters, verifiable in seconds

Security inks solve a two-sided problem: make life hard for counterfeiters, and give the inspector a clear answer within seconds. All four products in this series share one trait — they are condition-triggered. Under normal light they look like ordinary print; the mark only appears under UV, under IR excitation, above a temperature threshold, or in the dark. That trait is itself the security value: a counterfeiter does not know where to look, or what condition to test with.

The four technologies are fundamentally different, and they do not substitute for one another. UV fluorescent ink (254nm shortwave / 365nm longwave) is the most economical and the easiest to verify — a banknote detector or a UV torch is enough — which suits high-volume labels, hang tags and documents. IR excitation ink requires dedicated detection equipment and sits at a higher security tier, typically for high-security IDs and negotiable instruments. Thermochromic ink reacts to body heat, warm water or ambient temperature, so end users can verify it themselves — closer to visual security plus marketing interaction. Glow-in-the-dark ink relies on rare-earth long-afterglow pigment and is essentially a functional marking; its security value is lower than the other three. In practice the most common architecture is UV fluorescent as the base layer, with IR or thermochromic added on top to form a dual-channel system.

When covert security underperforms, the cause is usually the substrate rather than the ink. Paper containing fluorescent whitening agents glows under UV on its own, which masks the fluorescent mark and makes it look dim or absent. Please send the actual substrate and we will print a proof on your material before deciding whether a different stock or an opaque base coat is needed. Fluorescent colour, excitation wavelength and variable-data coding are all configurable; printed proofs are available for press trials.